Lost Admin access after WordPress Upgrade, getting 404 page

You recently upgraded your wordpress and you are unable to access you admin area! Every time you to access anything related to admin it will add some words to the URL and take you to a 404 (Not Found error message ) page. This is one of the wordpress upgrade problems that you may encounter.

Exactly this is what happened to me, my access to wordpress admin area was lost after wordpress update. I was not able to figure out what the problem is as there were no logs on the server that could help me. I tried to find a log in every folder through FTP but there was no trace.

The solution was easy once I stepped back and started thinking how to solve the issue. I was able to identify that during the wordpress upgrade it seemed to me that it didn’t complete properly. This forced me to think that I may need to cleanup my installation as this is a clear case of a problematic update.

Here is what I did in order to fix my Access to wordpress admin area that I lost after wordpress update :